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Friday, July 3rd, 2009
 I have been using my 80mm (400mm focal length) long enough now that I had forgotten what a difference there was to my 104mm Mak (1,325mm focal length).   Any tracking error is magnified 3 times.   Polar alignment has to be more precise.  
 
I decided to try M57 last night with my 104mm Mak....without a focal reducer on the camera.  I probably should have waited for a better night.   The sky seemed to improve about 2:30am, but by then I was putting my gear away.   During the imaging, there was a lot of haze....the sky was almost a light grey at times.   I decided to go ahead because M57 was virtually overhead.
 
104mm Maksutov-Cassegrain, CG5 GoTo mount, Orion StarShoot II color
 
I ran two sequences.   A:  40 subs @ 30 sec per sub  =  20 minutes
                                 B:  60 subs @ 20 sec per sub  =  20 minutes
 
7/3/09:  This is the best of my original processing of sequence A.   Although I spent a lot of time focusing, the images don't reflect it......not sure whether to blame the 'seeing' or my focusing skills.  Could be both. 
 
 
7/5/09:  Did some reprocessing.  (used 23 subs from sequence A)   I think this image looks a little more "natural".  Much more like the telescope image....although it still doesn't have that whispy....cloud-like appearance, or the detail I was hoping for.   I will keep at it for better data.
 
 


Image Gallery For This Session
M57 39x30 7 2 09 a m57a A5
   

M57_39x30_7_2_09_a.jpg
Click picture above for larger version
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Comments:
On 07/08/09 at 12:41pm Barry wrote:
I appreciate the encouragement....but as I said above, I am not too happy with it. Seeing was pretty poor, and the look of the nebula isn't what I was hoping for. These are better than my first processing attempts, but still leave something to be desired. It's probably going to take a DSLR to get the result I'm looking for.

On 07/06/09 at 03:26pm Miquel wrote:
This is a very nice picture of the Ring Nebula and you got great tracking. Nice job!

M.



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